Differential Ailerons
With differential ailerons, one aileron is raised a greater distance than the other aileron and is lowered for a given movement of the control wheel or control stick.
This produces an increase in drag on the descending wing.
The greater drag results from deflecting the up aileron on the descending wing to a greater angle than the down aileron on the rising wing.
While adverse yaw is reduced, it is not eliminated completely.
Frise-Type Ailerons
With a frise-type aileron, when pressure is applied to the control wheel, or control stick, the aileron that is being raised pivots on an offset hinge.
This projects the leading edge of the aileron into the airflow and creates drag.
It helps equalize the drag created by the lowered aileron on the opposite wing and reduces adverse yaw.
The frise-type aileron also forms a slot so air flows smoothly over the lowered aileron, making it more effective at high angles of attack.
Frise-type ailerons may also be designed to function differentially.
Like the differential aileron, the frise-type aileron does not eliminate adverse yaw entirely.
Coordinated rudder application is still needed when ailerons are applied.
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